تقرير
Measurement of the $2^+\rightarrow 0^+$ ground-state transition in the $\beta$ decay of $^{20}$F
| العنوان: | Measurement of the $2^+\rightarrow 0^+$ ground-state transition in the $\beta$ decay of $^{20}$F |
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| المؤلفون: | Kirsebom, O. S., Hukkanen, M., Kankainen, A., Trzaska, W. H., Strömberg, D. F., Martínez-Pinedo, G., Andersen, K., Bodewits, E., Canete, L., Cederkäll, J., Enqvist, T., Eronen, T., Fynbo, H. O. U., Geldhof, S., de Groote, R., Jenkins, D. G., Jokinen, A., Joshi, P., Khanam, A., Kostensalo, J., Kuusiniemi, P., Moore, I., Munch, M., Nesterenko, D. A., Ovejas, J. D., Penttilä, H., Pohjalainen, I., Reponen, M., Rinta-Antila, S., Riisager, K., de Roubin, A., Schotanus, P., Srivastava, P. C., Suhonen, J., Swartz, J. A., Tengblad, O., Vilen, M., Vińals, S., Äystö, J. |
| سنة النشر: | 2018 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | We report the first detection of the second-forbidden, non-unique, $2^+\rightarrow 0^+$, ground-state transition in the $\beta$ decay of $^{20}$F. A low-energy, mass-separated $^{20}\rm{F}^+$ beam produced at the IGISOL facility in Jyv\"askyl\"a, Finland, was implanted in a thin carbon foil and the $\beta$ spectrum measured using a magnetic transporter and a plastic-scintillator detector. The $\beta$-decay branching ratio inferred from the measurement is $b_{\beta} = [ 0.41\pm 0.08\textrm{(stat)}\pm 0.07\textrm{(sys)}] \times 10^{-5}$ corresponding to $\log ft = 10.89(11)$, making this one of the strongest second-forbidden, non-unique $\beta$ transitions ever measured. The experimental result is supported by shell-model calculations and has significant implications for the final evolution of stars that develop degenerate oxygen-neon cores. Using the new experimental data, we argue that the astrophysical electron-capture rate on $^{20}$Ne is now known to within better than 25% at the relevant temperatures and densities. Comment: 13 pages, 16 figures, 4 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.100.065805 |
| URL الوصول: | http://arxiv.org/abs/1805.08149 |
| رقم الأكسشن: | edsarx.1805.08149 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.100.065805 |
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